package cn.jsl.org.service.impl;

import cn.jsl.basic.service.impl.BaseServiceImpl;
import cn.jsl.org.domain.Department;
import cn.jsl.org.mapper.DepartmentMapper;
import cn.jsl.org.service.DepartmentServiceI;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 部门服务实现类
 */
@Service
public class DepartmentServiceImpl extends BaseServiceImpl<Department> implements DepartmentServiceI {
    @Autowired
    private DepartmentMapper departmentMapper;

    @Transactional
    @Override
    public void save(Department department) {
        //处理dirPath
        //1.没有选上级部门
        //Department( manager_id=327, manager=null, parent_id=null, parent=null, children=[])
        //2.选了上级部门
        //Department( manager_id=327, manager=null, parent_id=4, parent=null, children=[])
        //3.选了之后叉掉
        //Department( manager_id=326, manager=null, parent_id=null, parent=null, children=[])
        //添加之后会返回一个自增长id
        departmentMapper.save(department);

        //添加的时候对dirPath的处理
        String dirPath = "";
        if(department.getParent_id() == null){//没有选择上级部门 or //选了之后×掉了
            //获取自增id
            Long id  = department.getId();
            dirPath = "/" + id;
        }else{
            //获取上级部门
            Long parent_id = department.getParent_id();
            //获取上级部门的dirPath
            String parentDirPath = departmentMapper.loadById(parent_id).getDirPath();
            dirPath = parentDirPath + "/" + department.getId();
        }

        department.setDirPath(dirPath);
        departmentMapper.update(department);
    }



    @Transactional
    @Override
    public void update(Department department) {
        //添加的时候对dirPath的处理
        String dirPath = "";
        if(department.getParent_id() == null){//没有选择上级部门 or //选了之后×掉了
            Long id  = department.getId();
            dirPath = "/" + id;
        }else{
            //获取上级部门
            Long parent_id = department.getParent_id();
            //获取上级部门的dirPath
            String parentDirPath = departmentMapper.loadById(parent_id).getDirPath();
            dirPath = parentDirPath + "/" + department.getId();
        }
        //设置新的dirPath
        department.setDirPath(dirPath);
        departmentMapper.update(department);
    }



    @Override
    public List<Department> deptTree() {
        //一次性查询出所有数据，放到内存中，可以使用map
        //从所有数据中找出第一层级/顶级部门：这就是我们需要返回的数据
        //遍历所有部门只要不是第一层级的，找自己的上级，并将自己放入上级的children中
        //将所有的部门撞到map中  - 每次获取父部门都从这里获取
        List<Department> all = departmentMapper.loadAll();
        Map<Long,Department> map  = new HashMap<>();
        for (Department department : all) {
            map.put(department.getId(),department);
        }

        //前端需要得到的集合数据 - 部门树
        List<Department> deptTree = new ArrayList<>();
        for (Department department:all){
            if(department.getParent_id() == null){//顶级部门
                deptTree.add(department);
            }else{//不是顶级部门
                //找到当前部门的 父部门
                Long parent_id = department.getParent_id();
                //这种从数据库查询的方式，每次通过id去查询 - 查询出来映射给实体domain，children集合中都会是空集合 - 没有任何数据
                //Department parentDepartment = departmentMapper.loadById(parent_id);
                //下面这种是从Map中去获取的 - 以前装进去的对象还是会存在
                Department parentDepartment = map.get(parent_id);
                //将自己装到  父部门 的children中
                parentDepartment.getChildren().add(department);
            }
        }
        return deptTree;
    }
}
